<html>
<head>
	<meta charset="UTF-8">
	<meta content="IE=edge" http-equiv="X-UA-Compatible">
	<meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width" name="viewport">
	<title>4553：[Tjoi2016&Heoi2016]序列</title>
	<!-- css -->
	<link href="../css/base.min.css" rel="stylesheet">
	<link href="../css/project.min.css" rel="stylesheet">
	
	<!-- favicon -->
	<!-- ... -->
</head>
<body class="page-brand">
	<header class="header header-transparent header-waterfall ui-header">
		<ul class="nav nav-list pull-left">
			<li>
				<a data-toggle="menu" href="#menu">
					<span class="icon icon-lg">menu</span>
				</a>
			</li>
		</ul>
		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Tjoi2016&Heoi2016]序列</a>
		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Tjoi2016&Heoi2016]序列</span>
	</header>
	<nav aria-hidden="true" class="menu" id="menu" tabindex="-1">
		<div class="menu-scroll">
			<div class="menu-content">
				<a class="menu-logo" href="../index.html">BZOJ离线题库</a>
				<ul class="nav">
					<li>
						<a class="waves-attach" data-toggle="collapse" href="#problems">题目</a>
						<ul class="menu-collapse collapse in" id="problems">
							<li>
								<a class="waves-attach" href="../index.html">主页</a>
							</li>
							<li>
								<a class="waves-attach" href="../list.html">题目列表</a>
							</li>
						</ul>
					</li>
					<li>
						<a class="collapsed waves-attach" data-toggle="collapse" href="#about">关于</a>
						<ul class="menu-collapse collapse" id="about">
							<li>
								<a class="waves-attach" href="../about.html">关于此项目</a>
							</li>
						</ul>
					</li>
					
				</ul>
			</div>
		</div>
	</nav>
	<main class="content">
		<div class="content-header ui-content-header">
			<div class="container">
				<h1 class="content-heading">
                [Tjoi2016&Heoi2016]序列                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
		</div>
		<div class="container">
			<section class="content-inner margin-top-no">
				<div class="row">
					<div class="col-lg-13 col-md-13">
						<div class="card margin-bottom-no">
							<div class="card-main">
								<div class="card-inner">
									
                                <h3>题目描述</h3><p><p>&nbsp;佳媛姐姐过生日的时候，她的小伙伴从某宝上买了一个有趣的玩具送给他。玩具上有一个数列，数列中某些项的值</p>
<div>可能会变化，但同一个时刻最多只有一个值发生变化。现在佳媛姐姐已经研究出了所有变化的可能性，她想请教你</div>
<div>，能否选出一个子序列，使得在任意一种变化中，这个子序列都是不降的？请你告诉她这个子序列的最长长度即可</div>
<div>。注意：每种变化最多只有一个值发生变化。在样例输入1中，所有的变化是：</div>
<div>1 2 3</div>
<div>2 2 3</div>
<div>1 3 3</div>
<div>1 1 31 2 4</div>
<div>选择子序列为原序列，即在任意一种变化中均为不降子序列在样例输入2中，所有的变化是:3 3 33 2 3选择子序列</div>
<div>为第一个元素和第三个元素，或者第二个元素和第三个元素，均可满足要求</div></p><hr/><h3>输入格式</h3><p><p>&nbsp;输入的第一行有两个正整数n, m，分别表示序列的长度和变化的个数。接下来一行有n个数，表示这个数列原始的</p>
<div>状态。接下来m行，每行有2个数x, y，表示数列的第x项可以变化成y这个值。1 &lt;= x &lt;= n。所有数字均为正整数</div>
<div>，且小于等于100,000</div></p><hr/><h3>输出格式</h3><p><p>&nbsp;<span style="font-family: gbsnu8f; font-size: 9pt;">输<span style="font-family: gbsnu51; font-size: 9pt;">出<span style="font-family: gbsnu4e; font-size: 9pt;">一个<span style="font-family: gbsnu65; font-size: 9pt;">整数<span style="font-family: gbsnuff; font-size: 9pt;">，<span style="font-family: gbsnu88; font-size: 9pt;">表<span style="font-family: gbsnu79; font-size: 9pt;">示<span style="font-family: gbsnu5b; font-size: 9pt;">对<span style="font-family: gbsnu5e; font-size: 9pt;">应<span style="font-family: gbsnu76; font-size: 9pt;">的<span style="font-family: gbsnu7b; font-size: 9pt;">答<span style="font-family: gbsnu68; font-size: 9pt;">案<br style="orphans: 2; text-align: -webkit-auto; widows: 2;" />
</span></span></span></span></span></span></span></span></span></span></span></span></p></p><hr/><h3>样例输入</h3><pre>3 4
1 2 3
1 2
2 3
2 1
3 4</pre><hr/><h3>样例输出</h3><pre>3</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
								</div>
							</div>
						</div>
					</div>
				</div>
				
				
			</section>
		</div>
	</main>

	<div class="fbtn-container">
		<div class="fbtn-inner">
			<a class="fbtn fbtn-lg fbtn-brand-accent waves-attach waves-circle waves-light waves-effect" data-toggle="dropdown" aria-expanded="true"><span class="fbtn-text fbtn-text-left">Menu</span><span class="fbtn-ori icon">apps</span><span class="fbtn-sub icon">close</span></a>
			<div class="fbtn-dropup">
				<a class="fbtn fbtn-brand waves-attach waves-circle waves-light waves-effect" href="../list.html" target="_self"><span class="fbtn-text fbtn-text-left">题目列表</span><span class="icon">menu</span></a>
				<a class="fbtn fbtn-green waves-attach waves-circle waves-effect" href="../index.html" target="_self"><span class="fbtn-text fbtn-text-left">返回主页</span><span class="icon">home</span></a>
				<a class="fbtn waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/submitpage.php?id=4553" target="_blank"><span class="fbtn-text fbtn-text-left">提交代码</span><span class="icon">send</span></a>
				<a class="fbtn fbtn-orange waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/wttl/wttl.php?pid=4553" target="_blank"><span class="fbtn-text fbtn-text-left">试题讨论</span><span class="icon">chat</span></a>
				
			</div>
		</div>
	</div>

	<!-- js -->
	<script src="../js/jquery.min.js"></script>
	<script src="../js/base.min.js"></script>
	<script src="../js/project.min.js"></script>
</body>
</html>